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  #1  
Old September 24th, 2004, 20:25
rockethound rockethound is offline
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Rattling noise at low RPM

When I turn the A/C on in my jeep I hear a rattling noise underneath the engine. I can also hear it when the A/C is off, but only when i tap the gas a little. It seems that increase engine labor causes the rattle/clacking to get worse. I haven't pinpointed the orgin but it sounds somewhere around the Engine tranny union.

Any ideas?
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  #2  
Old September 25th, 2004, 00:18
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Professor Bobo Professor Bobo is offline
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Re: Rattling noise at low RPM

Are you sure its not the cat. converter? That can cause quite a racket.
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  #3  
Old September 25th, 2004, 00:23
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Talking Re: Rattling noise at low RPM

So will a cat!!!



Quote:
Originally Posted by Professor Bobo
Are you sure its not the cat. converter? That can cause quite a racket.
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  #4  
Old September 25th, 2004, 00:32
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Re: Rattling noise at low RPM

Hey guy, I had a cat (kitty type) on my motor once. Started my motor and yuck. Threw off my belts. Drove it to a coin-op car wash! eeeeeeewwww!
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  #5  
Old September 25th, 2004, 00:38
jpfreak jpfreak is offline
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Re: Rattling noise at low RPM

How about the muffler bracket (next to the gas tank) mine does that, just tighten it up and eventually it will come loose again.
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  #6  
Old September 25th, 2004, 00:47
junkxj junkxj is offline
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Talking Re: Rattling noise at low RPM

Quote:
Originally Posted by jpfreak
How about the muffler bracket (next to the gas tank) mine does that, just tighten it up and eventually it will come loose again.
Like every thing else on a xj
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  #7  
Old September 25th, 2004, 01:33
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Wayne Sihler Wayne Sihler is offline
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Re: Rattling noise at low RPM

Check the flex plate,flywheel bolts.The flex plate can crack or the bolts that attach it to the torque converter can come loose.Put a little loc-tite on the bolts when you tighten them.
Wayne
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  #8  
Old September 25th, 2004, 19:59
rockethound rockethound is offline
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Re: Rattling noise at low RPM

Quote:
Originally Posted by Wayne Sihler
Check the flex plate,flywheel bolts.The flex plate can crack or the bolts that attach it to the torque converter can come loose.Put a little loc-tite on the bolts when you tighten them.
Wayne
Does the problem that you mention here also cause the belt to wobble?
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  #9  
Old September 25th, 2004, 22:20
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Re: Rattling noise at low RPM

Quote:
Originally Posted by rockethound
Does the problem that you mention here also cause the belt to wobble?
Check your water pump... I saw one go once internally (a bearing gave out) and the little propellers were making a weird rattle as they were eating the housing away.
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  #10  
Old September 26th, 2004, 05:50
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Wayne Sihler Wayne Sihler is offline
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Re: Rattling noise at low RPM

Quote:
Originally Posted by rockethound
When I turn the A/C on in my jeep I hear a rattling noise underneath the engine. I can also hear it when the A/C is off, but only when i tap the gas a little. It seems that increase engine labor causes the rattle/clacking to get worse. I haven't pinpointed the orgin but it sounds somewhere around the Engine tranny union.

Any ideas?
There is NO belt at the "Engine tranny union" .The inside of the catalitic converter can come loose and rattle you will notice a noise at start up that may then go away .
Wayne
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  #11  
Old September 26th, 2004, 06:09
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Re: Rattling noise at low RPM

Quote:
Originally Posted by rockethound
Does the problem that you mention here also cause the belt to wobble?
Nope the bolts he was talking about was where the engine meets the tranny(AW4 Automatic). There are 4(3?) bolts that hold a thin shield onto the tranny. Those bolts can sometimes come loose and rattle. I would let the tranny cool off, pull the 4(3?) bolts off and remove the shield. Then check the torc converter bolts(if that's what is befind there?) and check the four bolts holding that on. It sounds like I had the same rattle you do, and that fixed it for me. The four bolts inside were not tight.
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  #12  
Old September 26th, 2004, 19:21
rockethound rockethound is offline
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Re: Rattling noise at low RPM

Quote:
Originally Posted by JohnJohn
Nope the bolts he was talking about was where the engine meets the tranny(AW4 Automatic). There are 4(3?) bolts that hold a thin shield onto the tranny. Those bolts can sometimes come loose and rattle. I would let the tranny cool off, pull the 4(3?) bolts off and remove the shield. Then check the torc converter bolts(if that's what is befind there?) and check the four bolts holding that on. It sounds like I had the same rattle you do, and that fixed it for me. The four bolts inside were not tight.
Did the rattle get worse when you starteded the a/c? And did it subside when it warmed up?
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  #13  
Old September 26th, 2004, 19:27
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Re: Rattling noise at low RPM

Yes on the AC, but it didn't matter if it was warm or cold. However the flex plate may expand with heat. Sorry I don't know more about that area of the XJ.
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